本論文旨在開發一風力開關式磁阻發電機為主之直流微電網。首先，建立一變頻供電永磁同步馬達驅動系統作為風力渦輪機之替代。為由市電供電永磁同步馬達驅動系統，開發一單相切換式整流器。可提供所研習風力開關式磁阻發電機良好之機械驅動能力，同時在電網側亦具有良好之入電電力品質。
接著，研製所開發之風力開關式磁阻發電機。由於開關式磁阻發電機不具自激能力，因此必須在其輸出端配置適當的外激電源，以成功建立電壓。在動態控制安排上，採用磁滯電流控制脈波寬度調變機構，以降低馬達之反電動勢效應。接著，設計一具快速電壓追控及調節響應之量化與強健電壓控制器，以對抗驅動速度及負載之變動。此外，進一步採用動態換相移位，以增強開關式磁阻發電機之發電特性與電壓控制性能。
一般，風力發電機之輸出電壓因變動之風速，輸出電壓有廣範圍的變化。因此，建構開關式磁阻發電機後接之具雙單元交錯式直流/直流升壓轉換器，由適當設計之電壓控制器，建立良好調節特性之直流匯流排，作為公共接入點。此外，開發一蓄電池儲能系統，提供微電網之能量緩衝，蓄電池經一雙向單臂升/降壓直流/直流轉換器連接至直流匯流排。
最後，設計實現一具三功率電晶體臂之負載變頻器，可作為單相三線變頻器或三相三線變頻器。當作為單相三線變頻器，產生單相220V/110V 60Hz之電壓源為家用電器供電，控制上採比例共振控制器，以獲得更好的正弦波形調控性能。對於三相三線變頻器，其用於微電網至電網/電網至微電網之雙向操作。在微電網至電網操作上，可提供電網有效功率與從事虛功補償。至於在電網至微電網操作上，三相交流電源可對微電網提供電能支撐。

This thesis develops an experimental wind switched-reluctance generator (SRG) based DC microgrid. First, an inverter-fed permanent-magnet synchronous motor (PMSM) drive is established and used as an alternative of wind turbine. To power the PMSM drive from the mains, a single-phase switch-mode rectifier (SMR) is developed. Good mechanical driven ability for the studied wind SRG is generated. Meanwhile, good line drawn power quality in the utility grid side is obtained.
Next, the wind SRG is designed and implemented. Since the SRG lacks self-excitation ability, a proper external excitation source is equipped at the SRG output for successful voltage building up. In dynamic control arrangement, the hysteresis current-controlled PWM (HCCPWM) scheme is adopted to counteract the back-EMF effects. Then, a quantitative and robust voltage controller is designed to have fast voltage tracking and regulation responses against the changed driven speed and load. In addition, a dynamic commutation shift is further applied to enhance the SRG generating characteristics and voltage control performance.
The wind generator output voltage is inherently varied in wide range with the fluctuated wind speed. Thus third, the SRG followed interleaved DC/DC boost converter with two cells is constructed. The proper voltage control is treated to establish a well-regulated common DC bus as the common access point. In addition, a battery energy storage system (BESS) is developed for providing energy buffer to the microgrid. The battery is connected to the microgrid common DC bus via a bidirectional one-leg boost-buck DC/DC converter.
Finally, a load inverter with three IGBT legs is designed and implemented. It can be operated as a 1P3W inverter or a 3P3W inverter. The 1P3W inverter yields single-phase 220/110V 60Hz AC sources to power the home appliances. The control schemes adopt proportional-resonant (PR) control to obtain better sinusoidal waveform control charac- teristics. As to the 3P3W inverter, it is used to conduct the bidirectional microgrid-to grid/grid-to-microgrid (M2G/G2M) operations. In M2G operation, the real power is sent to the grid and compensates the system reactive power. Conversely in G2M operation, the three-phase AC source provides power to support the DC microgrid.

LIST OF CONTENTS
ABSTRACT i
ACKNOWLEDGEMENT ii
LIST OF CONTENTS iii
LIST OF FIGURES vi
LIST OF TABLES xiii
CHAPTER 1 INTRODUCTION 1
CHAPTER 2 OVERVIEW OF MICROGRID CONSTITUTED COMPONENTS 5
2.1 Introduction 5
2.2 Microgrids 5
2.3 Wind Generators 7
2.3.1 Wind Turbines 7
2.3.2 Governing Equations and Power Characteristics 7
2.3.3 Typical Wind Generators 9
2.4 Permanent Magnet Synchronous Machines 11
2.4.1 Motor Structures 11
2.4.2 Physical Modeling 12
2.4.3 Measurement of Motor Parameters 14
2.5 Switched-Reluctance Machines 17
2.5.1 Motor Structures 17
2.5.2 Governing Equations and Dynamic Modeling 19
2.5.3 SRM Converters 21
2.5.4 Some Key Issues of SRG 23
2.6 Energy Storage Devices 24
2.7 Interface Converters 25
CHAPTER 3 PERMANENT-MAGNET SYNCHRONOUS MOTOR DRIVE BASED WIND TURBINE 29
3.1 Introduction 29
3.2 Permanent-magnet Synchronous Motor Drive 29
3.2.1 Power Circuit 29
3.2.2 Sensing and Interfacing Circuits 31
3.3 Control Schemes 33
3.3.1 Current-controlled PWM Scheme 33
3.3.2 Speed Control Scheme 34
3.4 Experimental Results 36
3.4.1 Starting Characteristics 36
3.4.2 Speed Dynamic Response 37
3.5 Boost SMR-Fed SPMSM Drive 38
3.5.1 Standard Boost SMR 39
3.5.2 SPMSM-driven SRG 46
CHAPTER 4 WIND SWITCHED-RELUCTANCE GENERATOR 47
4.1 Introduction 47
4.2 Switched-Reluctance Generator 47
4.2.1 Governing Equation 47
4.2.2 DC-link Ripple characteristics 49
4.3 Control Scheme 50
4.4 Performance Evaluation 56
4.5 Revaluation of the SRG system 64
CHAPTER 5 DC MICROGRID BASED ON SWITCHED-RELUCTANCE GENERATOR 66
5.1 Introduction 66
5.2 Interleaved Boost Converter 66
5.2.1 Circuit Operation 66
5.2.2 Power Circuit 69
5.2.3 Control Schemes 71
5.2.4 Experimental Results 74
5.3 Battery Energy Storage System 79
5.3.1 Power Circuit 79
5.3.2 Control Scheme 80
5.3.3 Measured Results 84
5.4 Single-phase Three-wire Inverter 85
5.4.1 Power Circuit 85
5.4.2 Dynamic Model 87
5.4.3 Control Scheme 89
5.4.4 Measured Results 92
5.5 M2G/G2M Operations via 3P3W Inverter 97
5.5.1 Power Circuit 97
5.5.2 3P3W Inverter in M2G Operation 98
5.5.3 3P3W Inverter in G2M Operation 101
CHAPTER 6 CONCLUSIONS 104
REFERENCES 105

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(c) Converters for Switched-reluctance Machines
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E. Energy Storage System
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F. Interface Power Converters
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G. PWM Inverters
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